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Next step in Mips16 prologue/epilogue cleanup.

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Save S2(reg 18) only when we are calling floating point stubs that
have a return value of float or complex. Some more work to make this
better but this is the first step.




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196921 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reed Kotler
2013-12-10 14:29:38 +00:00
parent 8a8581ca4b
commit 526522728c
9 changed files with 159 additions and 27 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/Target/Mips/Mips16FrameLowering.cpp
+21 -6
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@@ -15,6 +15,7 @@
#include "MCTargetDesc/MipsBaseInfo.h"
#include "Mips16InstrInfo.h"
#include "MipsInstrInfo.h"
#include "MipsRegisterInfo.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
@@ -56,17 +57,31 @@ void Mips16FrameLowering::emitPrologue(MachineFunction &MF) const {
MCSymbol *CSLabel = MMI.getContext().CreateTempSymbol();
BuildMI(MBB, MBBI, dl,
TII.get(TargetOpcode::PROLOG_LABEL)).addSym(CSLabel);
unsigned S2 = MRI->getDwarfRegNum(Mips::S2, true);
MMI.addFrameInst(MCCFIInstruction::createOffset(CSLabel, S2, -8));
const MipsRegisterInfo &RI = TII.getRegisterInfo();
const BitVector Reserved = RI.getReservedRegs(MF);
bool SaveS2 = Reserved[Mips::S2];
int Offset=-4;
unsigned RA = MRI->getDwarfRegNum(Mips::RA, true);
MMI.addFrameInst(MCCFIInstruction::createOffset(CSLabel, RA, Offset));
Offset -= 4;
if (SaveS2) {
unsigned S2 = MRI->getDwarfRegNum(Mips::S2, true);
MMI.addFrameInst(MCCFIInstruction::createOffset(CSLabel, S2, Offset));
Offset -= 4;
}
unsigned S1 = MRI->getDwarfRegNum(Mips::S1, true);
MMI.addFrameInst(MCCFIInstruction::createOffset(CSLabel, S1, -12));
MMI.addFrameInst(MCCFIInstruction::createOffset(CSLabel, S1, Offset));
Offset -= 4;
unsigned S0 = MRI->getDwarfRegNum(Mips::S0, true);
MMI.addFrameInst(MCCFIInstruction::createOffset(CSLabel, S0, -16));
MMI.addFrameInst(MCCFIInstruction::createOffset(CSLabel, S0, Offset));
unsigned RA = MRI->getDwarfRegNum(Mips::RA, true);
MMI.addFrameInst(MCCFIInstruction::createOffset(CSLabel, RA, -4));
if (hasFP(MF))
BuildMI(MBB, MBBI, dl, TII.get(Mips::MoveR3216), Mips::S0)